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tree-optimization/106497 - more forward threader can-copy-bb

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This adds EDGE_COPY_SRC_JOINER_BLOCK sources to the set of blocks
we need to check we can duplicate.

	PR tree-optimization/106497
	* tree-ssa-threadupdate.cc (fwd_jt_path_registry::update_cfg):
	Also verify we can copy EDGE_COPY_SRC_JOINER_BLOCK.

	* gcc.dg/torture/pr106497.c: New testcase.
This commit is contained in:
Richard Biener 2022-08-02 12:19:25 +02:00
parent 84beef30a5
commit 0f3514756e
2 changed files with 22 additions and 1 deletions
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20
gcc/testsuite/gcc.dg/torture/pr106497.c Normal file
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@ -0,0 +1,20 @@
/* { dg-do compile } */
/* { dg-additional-options "-fno-tree-dce" } */
int n;
__attribute__ ((pure,returns_twice)) int
bar (void);
int
foo (int x)
{
n = 0;
bar ();
if (x && n)
return 0;
foo (x);
}

3
gcc/tree-ssa-threadupdate.cc
View File

@ -2679,7 +2679,8 @@ fwd_jt_path_registry::update_cfg (bool may_peel_loop_headers)
{
edge e = (*path)[j]->e;
if (m_removed_edges->find_slot (e, NO_INSERT)
|| ((*path)[j]->type == EDGE_COPY_SRC_BLOCK
|| (((*path)[j]->type == EDGE_COPY_SRC_BLOCK
|| (*path)[j]->type == EDGE_COPY_SRC_JOINER_BLOCK)
&& !can_duplicate_block_p (e->src)))
break;
}